✨ Gaming Machine Standards
27 MAY NEW ZEALAND GAZETTE 1497
Fundamental RNG Requirement
3.14.3
The fundamental requirement is that the use of an RNG results in the selection of game symbols or production of game outcomes or selection of “mystery” jackpot values which are able to be proven to:
a) be statistically independent;
b) be uniformly distributed over their range;
c) pass various recognised statistical tests; and
d) be unpredictable.
3.14.4
RNG tests that may be applied include:
a) chi-square test;
b) equi-distribution (frequency) test;
c) gap test;
d) poker test;
e) coupon collector’s test;
f) permutation test;
g) run test (Patterns of occurrences should not be recurrent);
h) spectral test;
i) serial correlation test potency and degree of serial correlation (outcomes should be independent from the previous game); and
j) test on subsequences.
Choice of Algorithm
3.14.5
The choice of algorithm is at the discretion of the supplier of equipment, however, it must comply with the requirements of this document.
Background RNG Activity Requirement
3.14.6
The RNG must be cycled continuously between plays.
RNG Seeding
3.14.7
The method of seed-set generation must be approved.
3.14.8
The method of seed generation must ensure that:
a) the same sequence of random numbers is never used in more than one device at the same time (i.e. there is to be a method whereby each gaming machine can have a unique seed generation technique or RNG startup values).
b) the “next” game outcome is not able to be predicted.
3.14.9
Seeding and re-seeding must be kept to an absolute minimum. Both the method of re-seeding and the instances when it may occur must be approved. Re-seeding should not in general be under operator control. Re-seeding should not be a routine or regular practice.
3.14.10
If for any reason the background RNG activity is interrupted (e.g. gaming machine power down), the next input variable(s) for the RNG must be a function of the value(s) produced by the RNG immediately prior to interruption.
Minimum Period for Prize Determination using One RNG Value
3.14.11
Following a low probability game outcome (e.g. a jackpot win, major prize win, or a particular graphic game result presentation), where that game outcome is represented by only one RNG value or a small number of RNG values, it is important that subsequent game play on that machine is unpredictable. The intent here is to ensure that the machine does not subsequently go through one defined sequence of game outcomes, or one of only a few possible sequences of game outcomes, and that game outcomes are consistent with the mathematical model of the game. Thus in such implementations, the ‘Period’ of the RNG must be a factor greater than its ‘Range’.
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Online Sources for this page:
VUW Te Waharoa —
NZ Gazette 2003, No 56
Gazette.govt.nz —
NZ Gazette 2003, No 56
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Fundamental RNG Requirement
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🏛️ Governance & Central AdministrationRandom Number Generator, RNG, Gaming Machine, Statistical Tests, Independence, Uniform Distribution, Unpredictability